IE API兼容整理

1 function getCSS(elem,style){
2     if(window.getComputedStyle){
3         return getComputedStyle(elem)[style];
4     }
5     return elem.currentStyle[style]; // IE用
6 } 

1 Event.target -->  Event.srcElement;

1 Event.stopPropagation() --> Event.cancelBubble;

1 window.innerHeight --> document.documentElement.clientHeight --> document.body.clientHeight